Minutes_2018_10_30

Numba Meeting: 2018-10-30

Attendees: Stuart, Ehsan, Todd, Stan, Siu

0. Feature Discussion

• LLVM 7 status
  • breaking with SVML patch
  • llvmlite builds+tests fine
  • numba tests fine on linux; issues on win/osx
  • moving forward:
    • temp adjust version string for llvm7 builds to this the stack
• String status
  • PR overload(operator.getitem) #3375 updated
  • Added perf patch to disable refcount ops in critical loop
  • Unable to vectorize due to branch (see comment)
    • manual partial unroll?
  • move performance enhancement to another PR
• Debug logging for caught exception

1. New issues

• 3453 - Report actual problem in known places of constant inference failure
  • request for better error msg
• 3451 - Nested Jitclass Generator Memory Leak
  • confirmed bug
• 3448 - Link to jit-decorator-fastmath missing
  • fixed with PR
• 3446 - problem has occurred in Numba's internals.
• 3445 - Issue when trying to use python's any
  • known generator issue
• 3443 - Inject traceback in cuda raised exception
  • feature request
• 3442 - Implement NumPy trapz
• 3441 - funcsigs/inspect signature support (PEP 362 function signature object)
• 3439 - NotImplementedError followed by LoweringError
• 3438 - Add (or document) environment variable to disable parallelism

2. Open PRs

New

• 3452 - Fix broken link and mark up problem.
  • can merge when buildfarm is ready
• 3450 - [WIP] generated_jit for CUDA kernels
• 3449 - [WIP] Allow matching non-array objects in find_callname()
• 3437 - Changes to accommodate LLVM 7.0.x

Old

• 3429 - Fixes raising of user defined exceptions for exec(<string>).
• 3416 - Optimized usage of alloca out of the loop
• 3414 - [WIP] Refactor Const type
• 3403 - Fix label offset in call inline after parfor pass
• 3402 - Support negative indexing in tuple
• 3399 - Add max_registers Option to cuda.jit
• 3397 - Fix with-objmode warning
• 3392 - Launch and attach gdb directly from Numba.
• 3390 - typeinfer: use unknown_loc object instead of string literal
• 3385 - conda recipe: whitelist libiomp5.dylib
• 3382 - CUDA_ERROR_MISALIGNED_ADDRESS Using Multiple Const Arrays
• 3375 - Enable overload(operator.getitem)
• 3363 - [WIP] string support
  • see above discussion
• 3345 - Support for np.cov
  • ready for merge
• 3162 Support constant dtype string in nopython mode in functions like numpy.empty.
  • Need to resolve #3195
• 3160 First attempt at parallel diagnostics
  • Stuart will implement Todd's suggestion
• 3134 [WIP] Cfunc x86 abi
  • Needs re-review
• 3046 Pairwise sum implementation.
• #2999 Support LowLevelCallable
• #2950 Fix dispatcher to only consider contiguous-ness.
• #2942 Fix linkage nature (declspec(dllexport)) of some test functions
• #2894: [WIP] Implement jitclass default constructor arguments.
• #2817: [WIP] Emit LLVM optimization remarks

===========================

4. Next Release: Version 0.41, RC=Nov 19, Final=Nov 26, 2018

• Type refactoring
• Parallel diagnostics
• LLVM 7
• Initial string support
• Finishing off stalled PRs
• Usual collection of bug fixes and small features